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Java means Coffee Java Coffee Beans

Java means Coffee Java Coffee Beans. The name “JAVA” was taken from a cup of coffee. Introduction to JAVA. High Level Programming Language (HLL) Java , released in 1995, is a relatively new programming language.  

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Java means Coffee Java Coffee Beans

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  1. Java means Coffee Java Coffee Beans The name “JAVA” was taken from a cup of coffee

  2. Introduction to JAVA • High Level Programming Language (HLL) • Java, released in 1995, is a relatively new programming language.   • Developed by James Gosling from Sun Microsystems and his team

  3. Creating a Java Program .java javac .class java

  4. Java Program: a set of instructions for the computer to follow.  The source code. Saved as filename.java • Data: data for the Java program • Java Compiler (javac):translates the program from Java to a language that the computer can understand.  • Byte Code Program:  the compiler translates Java into a language called byte-code.  Byte code is the machine language for Java Virtual Machine (JVM). filename.class • Byte Code Interpreter (java):the interpreter (JVM) translates byte code into machine language (.exe) • Machine Language:  is the language the computer understands.

  5. Parts of a Java Program This is same as header file in C. This package is used for input and output. 

  6. Parts of a Java Program Every Java program is a class.   The program starts with the name of the class.   The class name must be the same as the . java file you save.

  7. Parts of a Java Program A main method is needed for execution to start.  This main method gets executed first.  The array of strings parameter is must.

  8. Parts of a Java Program Output statements:  the basic output statement in Java is the System.out.println( )   or System.out.print( )

  9. Variables Most Often Used

  10. Constant Variables • Constant is a variable whose value does not change in the program. Eg: PI = 3.14 The keyword ‘final’ is used to define constant in Java Eg. final intcount = 100; final double PI=3.14;

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